胶溶-水热晶化过程中纳米TiO2晶粒聚集机理及形貌的研究

doi:10.3724/SP.J.1077.2007.00059

无机材料学报

胶溶-水热晶化过程中纳米TiO₂晶粒聚集机理及形貌的研究

吕德义, 卞飞荣, 许可, 郑遗凡, 李小年

浙江工业大学资源与环境催化研究所, 绿色化学合成技术国家重点实验室培育基地, 杭州 310014

收稿日期:2006-01-06 修回日期:2006-05-12 出版日期:2007-01-20 网络出版日期:2007-01-20

Aggregation Behavior and the Resulting Morphology of Nanocrystalline Titania
in Peptization and Hydrothermal Process

LU De-Yi, BIAN Fei-Rong, XU Ke, ZHENG Yi-Fan, LI Xiao-Nian

Resource & Environment Catalysis Institute, State Key Laboratory Breeding Base of Green-Chemical Synthesis Technology, Zhejiang University of Technology, Hangzhou 310014, China

Received:2006-01-06 Revised:2006-05-12 Published:2007-01-20 Online:2007-01-20

摘要/Abstract

摘要： 通过XRD、SEM和动态光散射粒度测定仪(DLS)研究了胶溶及水热晶化过程中纳米TiO₂晶粒聚集行为及形貌. 实验结果表明, 在胶溶无定形沉淀过程中所形成的大小为10~15nm的锐钛矿(A)型胶粒或金红石(R)型胶粒(初级粒子)易定向聚集成更大的、具有(30~50)nm×(80~100)nm的次级晶粒. 含有次级晶粒的溶胶前驱液在水热晶化过程中, 次级晶粒发生崩裂并生长成结晶度更高的大小约为10~30nm球形(A型)和大小约为20~60nm棒状(R型)纳米TiO₂.

关键词: 二氧化钛, 聚集结晶, 胶溶, 水热晶化

Abstract: During the process of peptization and hydrothermal crystallization, the aggregation behavior and the resulting morphology of nanocrystalline titania (TiO₂) were studied by X-ray diffraction (XRD), scanning electron microscope (SEM), and dynamic light scattering (DLS) techniques. The results show that during peptization process the mixture of rutile-type and anatase-type primary particles with 10--15nm in diameter formed by peptizing the precipitated amorphous titania are transformed into rod-like secondary crystalline grains with sizes of (30--50)nm×(80--100)nm through an oriented aggregation mechanism, which obey a crystal face-matching rule. In the process of hydrothermal crystallization under 180℃, however, the rod-like secondary crystalline grains are first broken into nanoparticles with diameter in the range of 10--15nm (namely the same sizes as those of the primary particles), and the formed nanoparticles then grow in hydrothermal solution. The finally resulting particles with the sizes of 10--30nm (spherical anatase) and 20--60nm (rod-like rutile) are found to have a higher crystallization degree than the primary particles formed in the process of peptization.

Key words: titania, aggregation crystallization, peptization, hydrothermal crystallization

中图分类号:

TF123

吕德义,卞飞荣,许可,郑遗凡,李小年. 胶溶-水热晶化过程中纳米TiO₂晶粒聚集机理及形貌的研究[J]. 无机材料学报, DOI: 10.3724/SP.J.1077.2007.00059.

LU De-Yi,BIAN Fei-Rong,XU Ke,ZHENG Yi-Fan,LI Xiao-Nian. Aggregation Behavior and the Resulting Morphology of Nanocrystalline Titania
in Peptization and Hydrothermal Process[J]. Journal of Inorganic Materials, DOI: 10.3724/SP.J.1077.2007.00059.

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胶溶-水热晶化过程中纳米TiO₂晶粒聚集机理及形貌的研究

Aggregation Behavior and the Resulting Morphology of Nanocrystalline Titania
in Peptization and Hydrothermal Process

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